Street sweeper



Dec. 2 1924. I 1,520,315

J. H. STEWART STREET SWEEPER Filed July 24, 1922 4 Sheets-Sheet 1 INVENTOR WITNESSES ijafm fl fzewg i,

Dec. 1924- 1,520,315

J. H. STEWART vSTREET SWEEPER Filed July 24, 1922 4 Sheets-Sheet 2 IN VE/V TOR wlfnmssss Jofmfl jfewarf A TTORNE Y8 J. H. STEWART STREET SWEEPER 4 Sheets-Sheet s l I/ENTOR Q/O/M 1731292001"! flw ATTORNEYS I Patented Dec. 23, 1924.

UNITE TAT PATENT OFFKIE.

JOHN H. STEWART, OF NASHVILLE, TENNESSEE, ASSIGNOR OF ONE-HALF TO WILLIAM P. BUTLER, 0F NASHVILLE, TENNESSEE.

STREET SNEEPER.

Application filed July 24, 1922.

To all whom it may concern:

Be it known that I, JOHN H. STEWART, a citizen of the United States, and resident of Nashville, in the county of Davidson in the State of Tennessee, have invented certain new and useful Improvements in Street Sweepers, of which the following is a specification.

This invention relates to street sweepers and more particularly to a means for supplying a liquid coating to the street or road as the case may be.

Brie-fly stated an important object of this invention is to provide a street sweeper having a rotary broom and means associated with the broom for applying a liquid solution to the surface simultaneously with the cleaning operation for the purpose of laying the dust, cleaning and disinfecting.

A further object is toprovide a street sweeper of the character specified which is of highly simplified construction, durable in use and cheap to manufacture.

A further object is to provide an attachment for street sweepers which may be conveniently applied to any commercial sweeper without substantially altering the construction of the same and without impairing the sweeping qualities of the machine.

Other objects and advantages of the invention will be apparent during the course of the following description.

In the accompanying drawing, forming a part of this application and in which like numerals are employed to designate like parts throughout the same,

Figure 1 is a side elevation of the improved street sweeper equipped with the solution supplying means.

Figure 2 is a plan view of a street sweeper constructed in. accordance with the invention.

Figure 3 is a side elevation of the sweeper the view looking at the opposite side from Fig. 1.

Figure 4 is a detail horizontal sectional view illustrating the liquid distributing means and the rotary cleaning element.

Figure :5 is a detail transverse sectional view through the combined cleaning element and liquid distributer.

In the drawing wherein for the purpose of illustration is shown a preferred embodiment of the invention, the numeral 5 designates the frame of a street sweeper of any desired. construction While the numerals 6 Serial No. 577,160.

designate the wheels mounted on an axle 7. Figure 2 illustrates that the axle 7 and a diagonally extending stub shaft 8 are provided with coacting gears 9 which establish a driving connection between the aXle and the stub shaft.

The diagonally extending stub shaft is provided with a sprocket wheel 10 about which a sprocket chain 11 is trained and as clearly illustrated in Figure 3 the sprocket chain is also trained about a second sprocket wheel 14: having connection with a rotary cleaning element generally designated by the numeral 15.

Figure 4 illustrates that the lower sprocket wheel 1% is mounted on the journal 16 which is in turn rigidly connected to a steel cylinder 18 about which the rotary cleaning element is arranged. In other words the steel cylinder 18 forms a hub for the rotary sweeper and the rotation of the axle 7 is transmitted to the sweeper so that the sweeper will be revolved as the machine progresses.

Figure 4 further illustrates that the journal 16 is extended through a bearing member 20 suspended from the frame and employed for supporting one end of the sweeper. The other end. of the rotary sweeper is provided with a stub axle 22 extended through a hearing 23 of a hanger or bracket 24 secured in any suitable manner to the superstructure of the sweeper.

In carrying out the invention a liquid supply pipe 25 is extended axially through the journal 16 and the cylinder 18 and is also extended through a holding nut 26. A packing 27 is arranged within the journal 16 and provides a liquid tight connection between the pipe 25 and the journal.

As illustrated in Figure 1 the liquid sup ply pipe '25 is extended upwardly from the cylinder 18 and has connection with a liquid containing tank 28 mounted on the superstructure of the machine through the medium of one or more brackets or holding straps 29 or other suitable means. :Oil or other solution contained in-the tank 28 -flo'ws by gravity through the pipe 25 andis forced into the cylinder 18 through the medium of a pump 30 interposed in the intermediate portion of the pipe 25. It is thus seen that gravity is not entirely relied on as a means to feed the liquid through the cylinder 1'8 t that a pump pos tive y f rcesth-e liquid.

through the cylinder under the desired pressure. Figure 2 illustrates that a bypass 32 is connected to the pipe beneath the pump and when the pressure of the liqplurality of sections or units formed from bristles of any material and the sections may be wrapped around the cylinder and secured thereto in any suitable manner.

Figures 4 and 5 plainly illustrate that a plurality of liquid discharge tubes 37 are 1 extended radially through the cylinder 18 and terminate adjacent or at the periphery of the rotary cleaning element for conducting the liquid from the cylinder 18 to the surface being cleaned and-treated. It will be seen that the inner portion of the tubes 37 extend beyond the inner side wall of the cylinder 18 and are adapted to receive a quantity of liquid pumped into the cylinder. -In operation the improved machine is propelled in any suitable manner and the rotary element and the pump are simultaneously set into operation. By this means the cleaning and liquid coating processes are carried on simultaneously. The dust laying solution is forced through the perforated tubes 37 not in a stream but somewhat after the same manner of applying oil to a floor by an ordinary mop. That is to say the cleaning solution is discharged in small uantities and in this way several. applicatlons will be made on a paved street before the entire surface becomes saturated or covered with the cleaning solution; After a street is once thoroughly cleaned this method will serve to effectively allay dust, and sufli'cient of'the solution will be distributed on the pavement to prevent dust fiyi'ing' while the street is being swept. After severalapplications, theentire surface of the street'will be coated with the solution Which .is supplied through the liquid discharge tubes and the street will present a sanitary and waterproof surface.

mWith the general practice now in the cleaning'of streets is to flush them with a hose or pressure water sprinkler and then follow with a rotary broom to clean the This which the wind picks up and distributes broadcast. 1

With particular reference to Figure 5 it will be observed that the oil container within the cylinder 18 is discharged only at the periphery of the combined dust removing and oil-spreading brush 15, SO that the sides maintained comparatively free of oil.

of the bristles or cleaning elements are It will be seen that the accumulation of oil on the sides of and between the bristles would seriously impair the operation of the machine and would render'the operation of the machine quite expensive.

It is to be understood that the'form of the invention herewith shown and described is to be taken as a preferred example of the same and that such minor changes in arrangement and construction of parts may be made as will remain within the spirit and scope of what is claimed.

Having thus described the invention, what is claimed is 1. In a street cleaning and treating apparatus, the combination of a liquid containing. cylinder having a plurality of radially arranged tubes, and a combined cleaning liquid spreading element consisting of radial bristles secured about the cylinder and surrounding said tubes, said tubes forming a means for conveying the liquid directly from the cylinder to the surface to be cleaned and treated whereby the bristles are maintained comparatively free from the liquid dispensed.

2. In a' street cleaning and treating apparatus, the combination of an oil containing cylinder having-a plurality of radially arranged tubes, a cleaning elementconsisting of radial bristles secured about the} cylinder and surroundlng said tubes, said tubes forming a means for conveying the liquid from the cylinder directly to the'surface to i be cleaned and treated and means whereby to rotate the cylinder.

3. In a street cleaning and treating apparatus, the combination of a liquid containing cylinder having a plurality of radially arranged tubes, a cleaning element secured about the cylinder and surrounding said tubes, said tubes forming a means for conveying the liquid from the cylinder to the surface to be cleaned and treated, means whereby to rotate the cylinder, and a liquid supply pipe adapted to feed liquid to the cylinder under pressure, said tubes being adapted to supply the liquid onlyat the periphery of the cleaning element.

- 4. In astreet cleaning and treating apparatus, the combination of a liquid containing cylinder having a plurality of radially arranged tubes, radial bristles secured about the cylinder and surrounding said tubes, said tubes forming a means for conveying the liquid directly from the cylinder to the surface to be cleaned and treated, means whereby to rotate the cylinder, a liquid supply pipe adapted to feed liquid to the cylinder under pressure, and means whereby to rotate the cylinder and the cleaning elements arranged about the same, the sole discharge for the liquid being at the periphery of the cleaning element, f I

5. In a street cleaning and treating apparatus, the combination of a cylinder having a plurality of radially arranged liquid conveying tubes, a liquid supply pipe extending axially into the cylinder for supplying a cleaning solution to the same, a liquid containing tank connected to said pipe, and a pump interposed in said pipe.

6. In a street cleaning and treating ap paratus, the combination of a cylinder hav ing a plurality of radially arranged liquid conveying tubes, a liquid supply pipe extending axially into the cylinder for supplying a cleaning solution to the same, a liquid containing tank connected to said pipe, a pump interposed in said pipe, and a clean ing element secured about the periphery of the cylinder.

7. In a street cleaning and treating apparatus, a combined cleaning and liquid spreading element including bristles and a plurality of reed-like liquid discharge tubes extending through the bristles to the periphery thereof, said discharge tubes having openings of very small cross section whereby the liquid discharged from the tubes oozes from the outer ends of the tube in a small quantity to be applied by the bristles of the cleaning element in the form of a thin film, and means for supplying liquid to the tubes.

JOHN H. STEWART. 

